Cash And Cash Equivalents (Net Cash Provided By Operating Activities) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash and Cash Equivalents [Abstract]
Accounts receivable	$ (2,895)	$ 56,486
Accounts receivable from related companies	(44,891)	(46,460)
Inventories	(21,632)	30,464
Exchanges receivable	298	4,130
Other current assets	72,591	(20,539)
Other non-current assets, net	4,786	4,038
Accounts payable	(28,755)	(28,009)
Accounts payable to related companies	78,093	(12,706)
Exchanges payable	(5,473)	3,468
Accrued and other current liabilities	(9,721)	21,919
Other non-current liabilities	(5,267)	10,699
Price risk management assets and liabilities, net	21,501	(15,968)
Net change in operating assets and liabilities, net of effects of acquisitions and deconsolidation	$ 58,635	$ 7,522